The singer Alsarah: "Sudanese people said I wasn't Sudanese enough. Arabs said I wasn't an Arab. Americans said I wasn't American. I used to be like, 'I don't belong anywhere! Now I'm like you're all mine. All my countries, you're all mine."
A hamlet between the towns of Tsihombe and Ambovombe, in the most drought-stricken area in southern Madagascar. Most families in the region have resorted to eating wild fruits and tree leaves.
Courtesy of Jeanluc Siblot
Emmie de Wit, who usually works in a Biosafety Level 4 Lab, spent time in less secure labs in Liberia during the Ebola outbreak in West Africa. Above, she prepares to test Ebola patient blood samples.
Courtesy of NIAID
U.N. Secretary-General Ban Ki-moon, pictured during a 2014 visit to Haiti to inaugurate a sanitation campaign. On Thursday, he issued an apology that Haitians have been demanding for six years.
Hector Retamal /AFP/Getty Images